header {
  div.menu {
    height: 80px;
    width: 900px;
    margin: 0 auto;
    background-color: green;
    ul {
      li {
        list-style: none;
        a {
          color: white;
          font-size: 1.2em;
          text-decoration: none;
        }
      }
    }
  }
}
